how do you calculate probabily or this problem.

Question

A bag has 8 red, 6blue, 2 yellow and 7 green marbles. What is the probability of selecting a red, not replacing it and selecting a green?

6/21 * 7/21 =42/21

Answer 1

Total Marbles = 23

probability of selecting red = 8/23

probability of selecting green = 7/23

so after you chose red there are only 22 marbles left total. This means the probability of selecting green is 7/22

Answer 2

prob(red, then green)
= (8/23)(7/22)
= 28/253